IssueTracker

Android source code from which I come, because there I search for this error message:
http://crypto.nknu.edu.tw/AOSP/android-8.0.0_r4/frameworks/support/fragment/java/android/support/v4/app/Fragment.java

MainActivity}: java.lang.IllegalStateException: Fragment has not been attached yet.
Really helpfull exception...

Fragment.java:
   void instantiateChildFragmentManager() {
        if (mHost == null) {
            throw new IllegalStateException("Fragment has not been attached yet.");
        }
        mChildFragmentManager = new FragmentManagerImpl();
        mChildFragmentManager.attachController(mHost, new FragmentContainer() {
            @Override
            @Nullable
            public View onFindViewById(int id) {
                if (mView == null) {
                    throw new IllegalStateException("Fragment does not have a view");
                }
                return mView.findViewById(id);
            }

            @Override
            public boolean onHasView() {
                return (mView != null);
            }

            @Override
            public Fragment instantiate(Context context, String className, Bundle arguments) {
                return mHost.instantiate(context, className, arguments);
            }
        }, this);
    }


So please just add stupid name of fragment to log like in my gist:
https://gist.github.com/mtrakal/e418a7b15a9d16dcd55a6a66ea62a465/revisions